[sf-lug] what is kondemand and how to put it in a cage?
rick at linuxmafia.com
Fri Aug 17 12:51:55 PDT 2012
Quoting Jim Stockford (jim at systemateka.com):
> Anybody know what is kondemand?
Looks like a Linux kernel thread (which is why it shows in square
brackets in top or ps) that is the kernel interface for CPU frequency
scaling, and is part of the power-management subsystem. (The 'k' is for
kernel, not KDE.) It is classed as a 'governor' for frequency-scaling
purposes, and changes the CPUs' p-state (power-management state) and CPU
frequency depending on system demand. You will find that there is
one kondemand thread per CPU core.
It's basically part of the kernel background services. I wouldn't worry
about it -- unless you want to rev up CPU speed a bit for performance
purposes, in which case please see referenced kernel doc in my footnote.
> My machine has slowed waaaay down.
You might be able to tune power-management to give you less CPU
relaxation and more horsepower.
 See section 2.4 in
Where this document talks about a CPUfreq governor called 'ondemand',
that's the same thing as kondemand, as the k is a prefix convention
meaning kernel thread.
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